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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fbe48b8f75a8ccbca19b92fa06bc71927c3b8dfca63f31520a35311be30d815' 
  AND token = 'HDdwXxiL4wMFu+Aty47eiZKvAnMcLwXVBrL9kURfLLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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