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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef067193cf713a54c00e468eb3db97b10601db7c0926827fc653ef2d54fb9e0c' 
  AND token = 'ECa6eIalTW9fZRkypDNG53pXvrfZx4P5J+RgKUCJmQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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