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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed65f4ea75baca02cd6a66512ceb42b1835352730c7258bf712fcadd19732b7' 
  AND token = 'a966eJFAaad9o6Zcbk7LwkI2IrhTQQV1uK5k+WrtDvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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