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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e92df58cac8bf94ba777cc7b47584708bec5fc3c8dec401a59556db3171890' 
  AND token = '4FpX51CPvvGQzX7JupxzVq8gqi4nVACU+qa1lWws9H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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