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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44de706ab3de85cad59c2ef019accf88bbf8af9f46012044dfca038eb0c77a90' 
  AND token = 'VTO/HJLhq4ws0xzL1i3P11RRHg8aGzX4U0Uf0Ah38cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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