SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95417d503fe4d95071f0dd1e8279f43db7435fee15cfe6bf9483a6924088c8ab' 
  AND token = 'v573KR3Q4V1QKy1WCwQYujnl/9jpvs4J/hJWNQjwUWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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