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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09185ad7d3dd6b2a0f1180a9c5ec44efd78a7e0e107e158fedf74e0f702e070' 
  AND token = 'eVIzj0BQHgUFnrAtqe/du/89Ix3PggW3wUOQf+7tICc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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