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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee6678ae87c8cffc1fb1aa93a0dc896ec884f7ce8bffb5d78744565222d4acc' 
  AND token = 'CD/T9AZVUKCbqXC1YWeC4V1MitNCxjJITQc3gMIbCUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}