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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a61e4e0bee1075902c21277410ca8adccb2404a1850140e3a808980a30ee01fa' 
  AND token = 'OXYlRPpd9sgDVCdeXxqc83teJ53S9TRPY8/HoXozs0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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