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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3da057128ccd6a70e8fb0e94c3f325545006e562bcecbafb49b01d8f82016ef' 
  AND token = 'xF4cBigckE3sqig/fMLSo2Q/N++5MW3dNxih8aQEbXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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