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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90a005500f600028c7eb9e41430532cf7ad1c334dc5c7bcfebde40bd0b0eef4' 
  AND token = 'CLwkDtp9iwM+MkNmr9zuYeiYmj18QsxIiYRqn+nHCVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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