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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02dd31ad2e64d7d45c55eef8d3d89c925d8aca8346ec95be800d63e0d83a3644' 
  AND token = 'rNwwjeu3RLAorvIxuBVRx+fqSNNsb7b7dVtqznhJVm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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