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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1b1e4af8835281d55632a9c3f7719b4beeac254ece7c9bf2f7a34f2e0e1a36' 
  AND token = 'HmexkXIiEH9J0GA/MCk5VzECDizaGhqOjUE/jIcCZks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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