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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc37f48b99b4fe83730c4781ec170062a392631dc4fe5290760ee429616e4de3' 
  AND token = 'LLtxQNowkxuuw1m2woLCWCRvWqs+COYj5GtppDR/5aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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