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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a20ff73079e5e07e49959eb713b7261742e8da35dd0af078a05ea6a874c77c9' 
  AND token = 'KSUrLEidyn/h/DhIECtP9UKpiP0RzT/nWCSEmZjZ1sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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