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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832f37b5913cd33afaa8804d75200d9097aa7f1560266c420d03a7d61ba5d476' 
  AND token = 'cKr3cbFy1XUofE8z4d8QyVsKJMfK6e9jXsVlfQB79ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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