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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74261303026618ae22a4e2033c894614e8c55a6a620cfbd94f53fb13e2a04fb3' 
  AND token = 'AUwzi4WZ8j75ns02V1/km+i1WprXjerC6rAsjdz0MII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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