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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a2b445b373a8d4a3dc7c04e7028846778e49559d4db8e70bbc609c8eedae090' 
  AND token = '9AWJcGa9gChgspz4t1tm97iruuE7D1Vg1/NtdWncrtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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