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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d3dd528d55005a5df63c50be2bd1581121e8dc15515175a77266818cd6de97' 
  AND token = 's94lcW9tUxd7ir21ElJBTfgrtcDurpncYIQh6oi3tkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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