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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb11493e4ec48c3ba752eebd3d1dc495a02a69b71d1e2d67abdb01d000ef27b5' 
  AND token = '+15gRg3WCqB/rxscVy8lz8RYoQS1BS/iQjggXkDwmWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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