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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48b35b128594eb012922161bb5fd41f9e0f012700f37876acfbe8368bf1ab181' 
  AND token = '9JqvAXbhbYCiLXhz9QN8f7lqfOnUie8xbEsZF+07J+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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