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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f959a450ba5aa0766df45fb002512b7138967dbcc5a9a94ceddd9b3a928fdc42' 
  AND token = 'TMqZF68toGboREek2WAt5FxISk4EbmTWu0zT4yHCK8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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