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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f223648f4a4c8352aa594f8af7a6170e0a3baf350197d98e84cbfb395754c139' 
  AND token = 'Kd10NcPGJx3t0jlsXsk2EevwJYtxDFWn7HcOPYuAXMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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