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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd812a5989f7ffcd4e3b807c3b1316b36ed2cfc6b0e70ec2c5e90b83cd8c797' 
  AND token = 'GfO7YozeQsddzqPKAQTAlmoNQPVCRohMSZUBqN0d/MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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