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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c984a2f0de25646ed197237a53a98a7615b9e711fa1e95f134119a0e488b81e3' 
  AND token = 'NecgiZTka/3ekKeBW0ztFOLC/3ju4/LtZFP4nq84VN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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