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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4fa81809f299fc218c3372285a68de281b90c641e51b95ab1d88c432a9d90d6' 
  AND token = 'bAmPlBb7GzTd80DE8mc4ldzJlFFjZlJrrVrlWKdmb5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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