SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48c2537efd4e8aa609db3467fc6327cd492a9fba45c010c10d4338a5bc281cbb' 
  AND token = 'QmLvuwwbv+rp+6ZEQQYpWLA8JuGFg7gP4jsocDBsZVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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