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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e488e58f787efa54caf11c9ccc20222a61d6f7540a9f42d62edf648eb8ded7a' 
  AND token = 'Fqg6j93Sya/vGNPc/TtG07t4vtzgGKlT0PlCHb214Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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