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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92aa241b78eae2caa3cacb4350af2db462990d47bb4f757049b85fc02cf41cf2' 
  AND token = 'AXC/Fc0vQrXrRr+6PfWxnlSKwEII53SjpcbC2OXaJdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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