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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d7f51675861b94c0d4de9ad081da83f25114ba6080cc0dbaf7613660844e5a' 
  AND token = 'DjMWmWcYzybKKwM6QPJZ9DKCEndy+VrdQy42uI+Ue2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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