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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc687437aa3efdb86f71218b8a9fb40489de9de6a4768e7c88229b5ad4bfa63' 
  AND token = '8dJdo5FHkaGaQyGPbkpr3n3tpUfCpoxQNo/A/I36+FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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