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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812f114d80047ee0c035b9445d1c844ccc9ecbdcfd42b178b5eb9a2ff0a3a3a1' 
  AND token = 'UWYnaHYz7ult5+3hpX3hrML4bN4DtESVR3KDvHMboOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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