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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb89e02e62915751b8ff5a32c2909a7b334938a345e6f71f1984fd656d817bda' 
  AND token = '65Rirnlq7OaNMSuEF4kqVxqewqyyUYoJlLK8dodwG9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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