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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbd5afb59eb6c6d98bcc713f2c66aa1ad4e9d10da5f34f8edd3f46fd90c2e6d' 
  AND token = 'yhlNYSyfrSaNUXHvMn4I5F5rd8FIQfzE9fZx/DR0E1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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