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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f5702800a4565029752c077233cd6b3446c1b5d4027363080de3e53172dfed' 
  AND token = 'TebT1sFPg0isnhrRepRcgNwpcPx7dqOXh77KI6vKe0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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