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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f712d9b0cbc25b5d3be8ee2728d86541adf549777fc9f31daaa77eebff17ffe' 
  AND token = 'TmxY6zkBMNN+yebc4rwmSjtdR4lAIK++EsDHCwF2kl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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