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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a3cd8ee3dca97d0d740c6b9415399a40754fd83a54e2fc9cfe7e5370b4a8f8c' 
  AND token = 'fOLb6b1tJEb4HiHaibZyKvmCRQeMdKKEyE5rX/F0Vm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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