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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cebb065f8a16c4263c5cb7edcce7d0eba6a27a9d00f718fe85c3a8c3b8fb0bd' 
  AND token = 'fD1evw2V3HVkaxgb1NmfZ8xsOLja8SJ9Mf4vMgvYZ5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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