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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb33a84fc23df374ca19a7287451eed16ce0cda7e8d3ea00266724dda4da32f4' 
  AND token = 'sUAG88d0srstr0SPPoCp3rLZlLdbXfT+LuL/DMjjoRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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