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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beac7b165beb8dbd2e4b54d18813d09c75836b97d1f1b2f6cd3e5df170a8b068' 
  AND token = '7LpwsfGtCQeHMVZ52TMPxt4+4IOPRZ3Gim8IRyx+GmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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