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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b2f3e112a598ff441be8b567b48599b34ae516432ecaeadb742d675faa6e723' 
  AND token = 'v2q53hYRQ5poJ8R72lnmb+Lbbfz8k33H1I7wNv0IPkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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