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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4234ef2dbc4d32893db34360bae719f695db6b8f2d038e1cec5c9d2fa014329' 
  AND token = 'n8Vl3OhsrqD3mu+p3ZOSIxjG3XNA9zs9jKb3tJLMDM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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