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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0792d49a38428205cc44c96dd305a943f9e081eadb7f215a98146f6972ff29f' 
  AND token = 'YXBtp7yHeV/+k3TqfJuBf3xG0XpySYqvugQQxKfS99Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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