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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb43f21e76c4d261e845ecd4cd12bf1cf1d688cfd8e1d812e0be176aa6d7f99d' 
  AND token = 'Pase9OC8SKL8xh8DQm6e4/R2s/xAvn4ESzmKTMk7aUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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