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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec43283811969736c53a9f58f2382c0c59d3a61bb9f598b70136e6a9f5a37c5' 
  AND token = 'jiN0z6sa1ukYIiRPCbpNiPzcPE7n271UvyprUFru2Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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