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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d080d1aea280ac6e495830089ff3a95e9d270beeae298c6181b0c5bdfc57c9f' 
  AND token = 'TwSW6WAxSOx3J4TLrhg05ExH4nSug9OZme5GHggHHGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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