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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb39ac8b98327eb4e107d2d83f3fee06d967cef6db99a84f1456d8605cc40faa' 
  AND token = 'yXIulIeHe2bAdYanHE3k7vDwG+c4kLcH65Yt9goMQuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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