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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eb414d0f2736b2fa41057ae8cd1c93e94d7b0fc9930c99328e0439ba435bc9e' 
  AND token = 'AKgW8pBPQQm0svp3MY2Ghxgqn5Fcv894Hc1fKvHJXcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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