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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6c0658848eccd039629a5bca620b147380bb9c8e01f01051b0f88cb7aa6858' 
  AND token = 'O2Lf0e1AEI1nJcYJvJ9au35I523eo1Tfg5qCVvyh7z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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