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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e4cf43d82d312c8c75a7c6d7eddbd6eb782cf3c689befe2481334ca28858199' 
  AND token = 'pcqIZWsVM3WPv0SPoZP7lyDnC46j+ChX/KTN7HcOKT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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