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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fcea74e08485ccb50dde9988cfa7dabbb58acb6dadd612b5bee14480420e717' 
  AND token = '3QCOuJbL+2WSE0Q2tcWCTgaxNXD0uVaWY6rm59z9IoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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