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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b1ae8b95a446e1ef08ba06e38c50e46d27a637ea876c6e2ca1ed434ac28e1d' 
  AND token = 'Pq2vk4Iwda5Cv0SMACG3DiMC+gZxtZWmJrCENcTc+8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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