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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97cda0fbf9419b76470340315dfcc75576533cb74ea156d4b7a8fd9cc65b3b98' 
  AND token = 'XUisibYn1Cr0FhViOIY1Gy61knnhAIW7UKSS16h0VIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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