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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95affd958e8c9b59b3d6938faadd775cf3e34fb8bae4b7b96e1cdb0a173282e9' 
  AND token = '5ZT3CyCnQr9ug2Xy2P7hax96ZXst8d9TUoFz6ggm4f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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