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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7dd851da7bde916821cb48fa2077ff44603ae1542832ec2a44414f77e7a27a1' 
  AND token = 'l+ccmZwQ1rrIlZJ5sQASLjnXUkMHGCajElvSBZ8Aqko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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