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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a9b2f274e4adda3da35ce12e7c4c68b8897712d4d1b50117f05aafbd10b12b' 
  AND token = 'V43c9YL+Dm7O5SknorExzxtAjzB4V390xePVY5wd9zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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