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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c8b720fb2be53f1ad716e857ccd2d0d09e52e24273efdb129735ecfc807e74' 
  AND token = 'kNcv9/sxX6L6hVRe3UjezzE0oq13Kvct3fUyBFq7or4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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