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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3b9c3bec3f7e4e62588f4d9dd22fd9e163c7855cae4b09ee63e26aead35960' 
  AND token = 'QZo6I/3ixLuS0F2p08EHEiF8Pb5FgEc35F7YyQTuBCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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