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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fef22a7541a4df327030fc2a6166f2fe4e22d98781934693949eb3e4140daa6' 
  AND token = 'GZ0O3Usdhwt6ebtn+l4brSNWKDpqdJI7FZG7Qr7ME90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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