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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54b9309cf6573da48d126059d371f135d1d534abd902b070c6107eb91a26cdba' 
  AND token = 'S3GYw9TgnPINtJpzqH57+aTitG6arRHdrc2K528ycn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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