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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41c3a24a9772ae0eba63e8dcbe4fb4b8673a9369498dc1805f25c5a3244079bc' 
  AND token = 'TwxawipUHXG8es60d4/jFXRJ4X4PKayZoer5omW1aMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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