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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9763928771f6ef50b58e2a491ba84219b4f4eba553a512dea0a4af6f7b66aa5' 
  AND token = 'C9MYKizoOtTxSwtx03exdcU0RefeQ1mWHpUoVaeVlxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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