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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803543be032ac13d93d420bea45dac4ab23ec481d0796e6b52baff205d84dbee' 
  AND token = 'EVzFVZMJrzbXm9go71MKCf6oKjM2jPSEBwetOTf8iaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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