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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bab81a8ada99b76b38ed1ea5e1d02a0aca053b06531c20a07841314bd8699fbc' 
  AND token = 'zDypFJ8p/rXlfSMxMO1CrzQwNyJ8VRzkP/o6z0QFaFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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