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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6563ea15d1967a1327a7da3f73ccdbaa1b3def531b22803dc634c968b860090' 
  AND token = '1H3iSOIT20m4tMIA7sVK2WpMRZFomWJ0ti9zD2nxQ4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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